[dpdk-dev] [PATCH] vhost: notify guest to fill buffer when there is no buffer
Xie, Huawei
huawei.xie at intel.com
Thu Jan 29 11:39:49 CET 2015
> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of linhaifeng
> Sent: Thursday, January 29, 2015 6:30 PM
> To: dev at dpdk.org
> Subject: [dpdk-dev] [PATCH] vhost: notify guest to fill buffer when there is no
> buffer
>
> From: Linhaifeng <haifeng.lin at huawei.com>
>
> If we found there is no buffer we should notify virtio_net to
> fill buffers.
>
> We use mz send buffers from VM to VM,found that the other VM
> stop to receive data after many hours.
>
> Signed-off-by: Linhaifeng <haifeng.lin at huawei.com>
> ---
> lib/librte_vhost/vhost_rxtx.c | 9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/lib/librte_vhost/vhost_rxtx.c b/lib/librte_vhost/vhost_rxtx.c
> index ccfd82f..013c526 100644
> --- a/lib/librte_vhost/vhost_rxtx.c
> +++ b/lib/librte_vhost/vhost_rxtx.c
> @@ -87,9 +87,14 @@ virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id,
> /*check that we have enough buffers*/
> if (unlikely(count > free_entries))
> count = free_entries;
> -
> - if (count == 0)
> + /* If there is no buffers we should notify guest to fill.
> + * This is need when guest use virtio_net driver(not pmd).
> + */
> + if (count == 0) {
> + if (!(vq->avail->flags &
> VRING_AVAIL_F_NO_INTERRUPT))
> + eventfd_write((int)vq->kickfd, 1);
> return 0;
> + }
Haifeng:
Is it the root cause and is it protocol required?
Could you give a detailed description for that scenario?
>
> res_end_idx = res_base_idx + count;
> /* vq->last_used_idx_res is atomically updated. */
> --
> 1.9.0
>
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